Purification of telomers prepared from chlorotrifluoroethylene and trichlorotrifluoroethane
US4873382A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 22, 1988 |
| Grant date | Oct 10, 1989 |
| Priority date | — |
| Expiry date | Aug 22, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07C17/395
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A mixture of telomers prepared by reacting chlorotrifluoroethylene with 1,1,2-trichlorotrifluoroethane (CCl.sub.2 FCF.sub.2 Cl) is purified by reacting the telomer mixture with potassium hydroxide in the presence of a quarternery ammonium compound and, optionally, a glycol, separating and removing impurities from the telomer mixture, subsequently reacting the telomer with potassium permanganate in the presence of the quarternery ammonium compound in a solvent, and recovering a purified telomer mixture. If additional purity is required, the purified telomer mixture can be heated to a temperature of from about 150.degree. C. to about 250.degree. C. for at least 12 hours, and impurities formed during the thermal treatment are removed. The purified telomers of this invention find uses in applications requiring the use of non-flammable hydraulic fluids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.